From the 1 of 94 papers with an AI index.
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- M. Nicholl5 profiles10 · h 54
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15 papers · 1 filter
Towards understanding stellar variability at the sub m/s level: granulation-induced variability across the optical spectrum
Cis Lagae, Ginger Frame, Heather M. Cegla +5
Detecting the radial velocity signal of Earth-mass exoplanets requires the characterisation and removal of granulation-induced radial velocity variability from spectroscopic observ…
The Fe I 4377 Ã Line as a Solar Faculae Indicator: Insights from Spectral Ratio Analysis
Katlyn L. Hobbs, Christopher A. Watson, Jean C. Costes +21
Faculae are a dominant source of stellar activity noise in radial velocity measurements, yet their low contrast and broad surface distribution make them difficult to track in disc-…
An interstellar energetic and non-aqueous pathway to peptide formation
Alfred Thomas Hopkinson, Ann Mary Wilson, Joe Pitfield +13
The study demonstrates that dipeptides like glycylglycine can be synthesized in simulated interstellar ices under ionising radiation, providing a non‑aqueous pathway for peptide fo…
Height Dependent Phase Shifts of Wave Pulses in the Lower Solar Atmosphere Measured with SUNRISE III
Andreas Lagg, H. N. Smitha, Sami K. Solanki +32
We report on the measurement of the height-dependent time shifts of wave pulses in the lower solar atmosphere from high-resolution spectro-polarimetric observations obtained with t…
Spectral Ratio Analysis: probing of a new suite of stellar activity indicators as a tool for astrophysical noise mitigation
Jean C. Costes, Christopher A. Watson, Ernst de Mooij +6
Stellar activity is the main barrier to detecting and/or confirming low-mass/long-period (and Earth-analogue) planets using radial-velocity (RV) measurements. Searching for reliabl…
Multi-height Identification of Sausage and Fluting Eigenmodes in a Solar Pore
Shahin Jafarzadeh, David B. Jess, Marco Stangalini +34
Magnetic pores are compact, strongly magnetised waveguides in the lower solar atmosphere and therefore provide favourable conditions for identifying magnetohydrodynamic (MHD) wave…